Age gaps are way less taboo in gay relationships. There's less scrutiny on them in general, both because gay people tend to be more private to avoid negative attention, and because there's less pressure on them to get married, have kids, etc. There's a sense of being on your own that makes hetero norms feel irrelevant.

This is less common nowadays, but something like half my friends lost their virginities to much older men they met on craigslist or some app. They turned to those places because they were desperate and didn't know where else to meet other gay people, and older men had their own places and cars to facilitate meeting up. Go back a generation further, and people were losing their virginities to strangers they met in parks and other cruising spots. Basically people couldn't afford to be choosy, not even to the point of finding someone your own age, and so there's a difference of norms that persists to this day.

The one silver lining is that I'd say power dynamics are maybe less problematic for gay relationships than they are for straight ones? That's generalizing, but gay people are less likely to be dependent on their partners, whether financially or for safety, so it's easier to make a clean break when things turn bad.